Oscar-winning "Frozen" songwriters Robert and Kristen Anderson-Lopez have written a new song for two of the film's characters, according to Twitter postings by the married couple.

Robert Lopez and Kristen Anderson-Lopez
Photo by Joseph Marzullo/WENN

Robert Lopez tweeted Nov. 16, "Finally wrote a duet for Anna and Kristoff! Apologies to Groffsauce for the lateness." His wife responded, tweeting, "Why didn't we think of this before? It was so fun to write!!"

Finally wrote a duet for Anna and Kristoff! Apologies to Groffsauce for the lateness.
@Lyrikris10